Well, I'm not any kind of expert but I have spent a lot of time hanging around paranormal and ghostcam sites, and I think I can tell you what this
is.
No flash was used in these pictures and they were taken at night, which results in a long exposure (i. e. the camera's shutter is open for a long
time to get enough light to create the image). Someone(s) walked into/through the frame while the shutter was open, creating what's called a 'motion
blur.' These images can be quite freaky, and the figure appears to be partially see-through because the camera
was seeing what's behind the
figure for part of the exposure. Motion blur also causes distortion because of the movement of the subject.
It looks to me like the pictures are of 2 or 3 different people, one of them does appear to be walking a dog.
Here are a few other examples of motion blur and how it makes people/things appear 'ghostly.'
How to Avoid Motion Blur
Motion Blur "Ghost"
Ghost Crossing
Swing Dance Motion Blur 
